Function compatH

packages/runtime-core/src/compat/renderFn.ts:122–173

(
  type: any,
  propsOrChildren?: any,
  children?: any,
)

): VNode

export function compatH(
  type: any,
  propsOrChildren?: any,
  children?: any,
): VNode {
  if (!type) {
    type = Comment
  }

  // to support v2 string component name look!up
  if (typeof type === 'string') {
    const t = hyphenate(type)
    if (t === 'transition' || t === 'transition-group' || t === 'keep-alive') {
      // since transition and transition-group are runtime-dom-specific,
      // we cannot import them directly here. Instead they are registered using
      // special keys in @vue/compat entry.
      type = `__compat__${t}`
    }
    type = resolveDynamicComponent(type)
  }

  const l = arguments.length
  const is2ndArgArrayChildren = isArray(propsOrChildren)
  if (l === 2 || is2ndArgArrayChildren) {
    if (isObject(propsOrChildren) && !is2ndArgArrayChildren) {
      // single vnode without props
      if (isVNode(propsOrChildren)) {
        return convertLegacySlots(createVNode(type, null, [propsOrChildren]))
      }
      // props without children
      return convertLegacySlots(
        convertLegacyDirectives(
          createVNode(type, convertLegacyProps(propsOrChildren, type)),
          propsOrChildren,
        ),
      )
    } else {
      // omit props
      return convertLegacySlots(createVNode(type, null, propsOrChildren))
    }
  } else {
    if (isVNode(children)) {
      children = [children]
    }
    return convertLegacySlots(
      convertLegacyDirectives(
        createVNode(type, convertLegacyProps(propsOrChildren, type), children),
        propsOrChildren,
      ),
    )
  }
}

const skipLegacyRootLevelProps = /*@__PURE__*/ makeMap(
  'staticStyle,staticClass,directives,model,hook',